From the Offspring's song "Pretty Fly For A White Guy", in which the character wants a tattoo of the number '13' to be cool...

"He asked for a '13', But they drew a '31'"

The tattoo of the number 13 has several different connotations.
In the tattoo world, it's the opposite of 'unlucky 13' and is a symbol of GOOD luck.
It's also the 13th letter of the alphabet and is used to represent "La Eme" or "the Mexican Mafia", a hard-core violent Mexican street gang. Some wannabees get it inked to act tough.
Being the 13th letter, other get it to symbolize that they smoke marijuana.

"He asked for a '13', But they drew a '31'" - The Offspring (Pretty Fly For A White Guy)

The Urban Dictionary Mug

A verb meaning to mount a big comeback or to win despite a very low probability. Inspired by sporting events from 2016: the Warriors came back to win the NBA Western Conference Finals four games to three despite being down three games to one, the Cavs came back to win despite being down 3-1 to the Warriors, and the Cubs won in seven despite being down three games to one to the Indians.

"Trump 3-1'd Hillary, everyone thought she would win."
"Did you watch the Cubs 3-1 the Indians, it was ridiculous."
"2016 was the year of the 3-1"